Common Communication Abbreviations and Their Meanings

ADM Add-Drop Multiplexer Add/Drop Multiplexer
AIS Alarm Indication Signal Alarm Indication Signal
ATM Asynchronous Transfer Mode Asynchronous Transfer Mode
AU Administrative Unit Administrative Unit
AUG Administrative Unit Group Administrative Unit Group
CRC Cyclic Redundancy Check Cyclic Redundancy Check
CV Coding Violation Coding Violation
DXC Digital Cross Connect Digital Cross Connect
FDDI Fiber Distributed Data Interface Fiber Distributed Data Interface
ID Identifier Identifier
LOF Loss Of Frame Loss of Frame
LOS Loss Of Signal Loss of Signal
OAM Operation Administration and Maintenance Operation, Administration and Maintenance
OOF Out Of Frame Out of Frame
OW Order Wire Order Wire
PDH Plesiochronous Digital Hierarchy Plesiochronous Digital Hierarchy
PSTN Public Switched Telephone Network Public Switched Telephone Network
RDI Remote Defect Indication Remote Defect Indication
SDH Sychronous Digital Hierarchy Synchronous Digital Hierarchy
TUG Tributary Unit Group Tributary Unit Group
VC Virtual Container Virtual Container